Type-writer key and type-bar mechanism.



PATENTED MAY 19. 1908.

No. 887,745. R

I J. ALEXANDER.

TYPE WRITER KEY AND TYPE BAR MECHANISM.

, APPLICATION FILED FEE-10. 1906. I

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No. 887,745. PATENTED MAY 19, 1908.

a J'. ALEXANDER.

TYPE WRITER KEY- AND TYPE BAR MECHANISM.

APPLICATION FILEDIEB. 10. 1906.

2 SHEETS-SHEET 2.

JESSE ALEXANDER, O1 BROOKLYN, NEW YORK.

' TYPE-WRITER KEY AND TYPE-BAR MECHANISM.

Specification of Letters Patent.

Patented May 19, 1908.

Application filed February 10, 1906. Serial No. 300,404.

.To all whom it may concern:

Be it known that I, JEssE ALEXANDER, a citizen of the United States, residing at Brooklyn, county of Kings, and. State of New York, have invented certain new and useful Improvements in Type-Writer Keys and Type-Bar Mechanism, of which the following is a full, clear, and exact description.

My invention relates to improvements in typewriting machines, and particularly to a key and type bar mechanism.

The object of the invention is to provide a simple and reliable construction in which the action shall be uniform and the touch light and elastic as well as quick.

'The rinciples' of the invention are illus trated in the accompanying two sheets of drawings.

Figure 1' is a front view of a typewriting machine embodying the improvements of my invention, only one unit of the key bar mechanism, however, being shown. Fig. 2 is a sectional view showing a type bar unit in its normal position, also showing the parts, dotted, in the position which they occupy after the printing stroke has 'ust been begun. This also shows in dot an dash lines the parts in thefposition which they occupy just as the normal operative printing pressure ceases. Fig. 3 is a fragmentary plan view showing the universal bar mechanism. Fig. 4 is a sectional view showing a unit of the key and type bar mechanism in its rintin position and also showing in dotte lines t. e osition which the parts occupy shortly a ter leaving the printing position.

The key bars are arranged as is customary in typewriting machines, and the machine is preferably of the so-called single shift type, wherein the type bars are arranged to cause the imprint on the paper at the front of the platen-so that the printing is visible at all times. In this type of -machine the type bars are arranged in the arc of a circle.

1 is a key lever, pressed upwardly by the spring finger 2.

3 is a pivoted intermediate lever having horizontally and vertically disposed arms. The key bar 1 has aheadedstud 4 which operates in a slot in the intermediate lever.

5 is a type bar pivoted at 6. Downward and backward from the pivot 6 is a tail-piece 7 carrying a stud 8. This stud operates in a slot in the link 9 which is connected to the u per end of the vertical arm of the intermediate lever 3.

10 is a shoulder formed on the type bar some little distance below its pivot, and which is normally engaged by the portion 11 of the intermediate lever. The first pressure of the key lever is therefore transmitted through the intermediate lever to the shoulder of the type bar at some little distance from its pivot, which gives a considerable leverage. The continued depressionof the key lever causes the upper end 12 of the intermediate lever to engage a oint 13 on the type bar nearer the ivot so t at the speed of the type bar is acce erated. This posltion is shown in dotted lines in Fig. 2. Further depression of the key lever brings the link 9 into cooperation with the stud 8 on the tail of the type bar at about the position shown in dot and dash lines in Fig. 2, so as to give a direct and positive pull upon the type bar. As the type bar approaches the printing position, as shown in full lines in Fig. 4,, the shoulder 14 is brought into cooperation with the universal bar 15 which operates the carriage feed and ribbon shifting mechanism. These mechanisms will be claimed in other applications to be filed. The spring 16 cooperates with the universal bar to move it back to its normal position and move the type bar away from the printing point. At about the position shown in dotted lines in Fig. 4, the shoulder 17 on the intermediate lever engages. the tip 18 on the tail piece of the type bar and through the medium of the spring 2 accelerates the action of the type bar in returning to its normal position. In the normal position the type bars rest upon the p The advantages of the gradually accelerated printing stroke and of the quick return from the prlnting position will be apparent to those ac uainted with this art.

What I c aim is:

1. A typewriter'key and type bar mechanism comprising a key lever, an intermediate lever connected thereto, and havin a vertical arm, a type bar having a shou der normally engaging the intermediate lever, and a link connected to'said intermediate lever and said type bar, but normally inoperatively connected with one of said members.

4 2. A key and type bar mechanism for a typewriting machine comprising a key lever, an intermediate lever connected thereto, a type bar having a shoulder normally disengaged from the upper end, of the intermediate ever but adapted to be engaged thereby during1 the operationof the rinting stroke, and a 'nk conneetedto sai intermediate lever and adapted to'be connected with the type bar during the operation of the printing stroke.

3. A key and type bar mechanism comprising a key lever, an intermediate lever connected thereto, a link ada ted to connect the intermediate lever andot e type bar, a tail-piece on the type bar and a shoulder on the intermediate lever adapted to enga e the tail-piece during the return of the type in to its normal position.

4. In a key and type bar mechanism'a key lever, an intermediate lever, a ivoted type bar, said type bar having a shou der substantially beneath the pivot normally engaged by the intermediate lever, and means of connec' tion between the type bar and" said intermediate lever.

5. In a key and type barmeohanism a key lever, an intermediate lever, a pivoted type bar having a tail-piece projecting downwardly and rearwardly of its pivot adapted at one point of its movement to be engaged by said intermediate lever, and a link'connec tion projecting forwardly from the tail-piece 0111 its pivot, and means of connection be-\ tween said tail-piece and said intermediate lever.

JESSE ALEXANDER.

Witnesses;

R- C: MITCHELL, L. VREELAND. 

